Seven-Lens Optical Layout for Slim Ultra-Wide Mobile Imaging
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Solution Overview
Problem
The challenge is to develop a slim optical imaging lens system for mobile devices that can capture high-resolution images while maintaining a compact size and being suitable for ultra-wide-angle shooting, especially in dark environments, without increasing the total length of the optical system.
Innovation Solution
The optical imaging lens system consists of seven lenses, including a first lens with a convex image-side surface and a sixth lens with a concave object-side surface, satisfying specific conditional expressions for curvature, thickness, and refractive power relationships, along with aspherical surfaces, to achieve miniaturization and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the image sensor increases to capture high-resolution images, then the image quality is improved, but the total length of the optical system increases
Solution Approach 1:
The optical system is divided into seven distinct lens groups (first lens to seventh lens), each with specific refractive power and surface curvature characteristics. This segmentation allows for optimized light path control across different optical zones, enabling compact overall length while maintaining high-resolution imaging capability on larger sensors.
Solution Approach 2:
The patent employs specific parameter relationships including conditional expressions for curvature radii (e.g., L6R1/CT6), thickness ratios (e.g., CT4/CT6), and refractive power distributions across the seven lenses. These parameter optimizations enable the system to achieve both large image sensor compatibility and reduced total length by precisely controlling optical path geometry.
2Length of moving object
If the optical system is slimmed down to reduce device size, then the device thickness is reduced, but the ability to capture high-resolution images deteriorates
Solution Approach 1:
The optical system incorporates aspherical surfaces on multiple lens elements, including the first lens with a convex image-side surface and the sixth lens with a concave object-side surface. These dynamic surface geometries enable efficient light ray control in a compact configuration, maintaining high-resolution imaging performance while reducing overall system thickness compared to traditional spherical lens systems.
Solution Approach 2:
The patent utilizes lenses with different refractive indices and Abbe numbers distributed across the seven lens groups. This composite optical design allows for chromatic aberration correction and optimized light path control within a slim form factor, enabling high-resolution imaging without increasing system thickness.
3Adaptability or versatility
If the field of view is expanded to 115° or more for ultra-wide-angle shooting, then the shooting angle is improved, but optical aberrations increase
Solution Approach 1:
Different lens elements in the seven-lens system are assigned specific local optical characteristics: the first lens has a convex image-side surface for wide-angle light reception, the fifth lens has negative refractive power with a concave image-side surface for aberration correction, and the sixth lens has a concave object-side surface for field curvature control. This localized optimization of optical properties across different zones enables ultra-wide 115° field of view while maintaining acceptable aberration levels.
Solution Approach 2:
The patent converts the inherent optical challenges of ultra-wide-angle design into benefits by using the specific surface curvatures and refractive power distributions to correct aberrations. The aspherical surfaces and carefully designed lens configurations transform what would normally be harmful wide-angle distortions into controlled optical paths that achieve both 115° field of view and acceptable image quality.
4Length of moving object
If the lens configuration is optimized for compact size, then the device thickness is reduced, but chromatic aberration and flare phenomena increase
Solution Approach 1:
The patent implements specific parameter relationships including the conditional expression L6R1/CT6 for the sixth lens curvature and thickness, CT4/CT6 for lens thickness ratios, and distributed refractive power across seven elements. These parameter optimizations enable compact device thickness while simultaneously controlling chromatic aberration through dispersion management and reducing flare through optimized surface geometries and aspherical corrections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a compact design capable of capturing high-resolution images with a field of view of 115° or more and a brightness level of less than 2.0, effectively minimizing chromatic aberration and flare phenomena.
Implementation Method 1
an optical imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in order from an object side
Data Source
AI summary
An optical imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in order from an object side, wherein the first lens has a convex image-side surface, and the sixth lens has a concave object-side surface, and the following conditional expression is satisfied: (TTL/IMH)*Fno<1.7, where TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging plane and IMH is a diagonal length of the imaging plane.